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Discover how the Vera C. Rubin Observatory in Chile found two hidden companions of our Milky Way — Aquarius IV, a possible ultra-faint dwarf galaxy about 355,000 light-years away, and Rubin-GC1, a star cluster hiding behind dust on the far side of our galaxy. Learn why Aquarius IV's identity is still unconfirmed, how about 65 satellite galaxies are known so far, and why Rubin's ten-year survey is expected to reveal hundreds more faint neighbours. Keywords: Milky Way, Rubin Observatory, Aquarius IV, Rubin-GC1, dwarf galaxy, star cluster, satellite galaxies, Vera Rubin, astronomy, space, science
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